WO2020207221A1 - Écran d'affichage, procédé de reconnaissance d'empreinte digitale et dispositif d'affichage - Google Patents

Écran d'affichage, procédé de reconnaissance d'empreinte digitale et dispositif d'affichage Download PDF

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Publication number
WO2020207221A1
WO2020207221A1 PCT/CN2020/080134 CN2020080134W WO2020207221A1 WO 2020207221 A1 WO2020207221 A1 WO 2020207221A1 CN 2020080134 W CN2020080134 W CN 2020080134W WO 2020207221 A1 WO2020207221 A1 WO 2020207221A1
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WO
WIPO (PCT)
Prior art keywords
fingerprint
display panel
tested
imaging area
small hole
Prior art date
Application number
PCT/CN2020/080134
Other languages
English (en)
Chinese (zh)
Inventor
冯彬峰
刘颖
李奇峰
罗永辉
王超
李飞
赵海瑞
陈禹鹏
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 京东方科技集团股份有限公司, 成都京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2020207221A1 publication Critical patent/WO2020207221A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/126—Shielding, e.g. light-blocking means over the TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors

Definitions

  • This article relates to the field of touch display technology, in particular to a display panel, a fingerprint identification method and a display device.
  • Fingerprints are inherently unique and invariant features of the human body that can be distinguished from them. It consists of ridges and valleys on the surface of the fingertips. The composition details of these ridges and valleys determine the uniqueness of the fingerprint pattern.
  • the display panel with fingerprint recognition function developed therefrom has been used for personal identity verification, increasing the information security of the display device.
  • the existing display panels generally have a fingerprint recognition function.
  • the present application provides a display panel including: a base substrate and a light shielding layer, a light emitting device, and a sensor assembly disposed on the base substrate; the light shielding layer is located on the light emitting device and the sensor assembly between;
  • the light shielding layer includes: a small hole imaging area; the size of the small hole imaging area in the first direction is smaller than the size of the fingerprint to be tested in the first direction, and the small hole imaging area is in the second direction.
  • the size in the direction is larger than the size of the fingerprint to be tested in the second direction; the small hole imaging area is used to image a part of the fingerprint to be tested on the sensor component when the fingerprint to be tested is detected.
  • the light shielding layer is located on a side of the base substrate close to the light emitting device, and the sensor assembly is located on a side of the base substrate away from the light shielding layer.
  • the orthographic projection of the light shielding layer on the base substrate covers the orthographic projection of the light-emitting device on the base substrate.
  • the orthographic projection of the sensor assembly on the base substrate covers the orthographic projection of the aperture imaging area on the base substrate.
  • the length of the small hole imaging area is greater than the width of the fingerprint to be measured, and the width of the small hole imaging area is less than the length of the fingerprint to be measured.
  • the small hole imaging area includes a plurality of openings arranged in an array; the centers of the openings located in the same row or column are on the same straight line.
  • the shape of the opening is circular, and the diameter of each opening is 3 ⁇ m-25 ⁇ m.
  • the distance between adjacent openings is equal.
  • the sensor component includes: an image sensor for acquiring multiple partial fingerprint images of the fingerprint to be tested above the display panel passing through the aperture imaging area;
  • the display panel further includes: a processor
  • the processor is connected to the image sensor, and is used for splicing and combining the received multiple partial fingerprint images to form a complete fingerprint image.
  • the sensor assembly further includes: a pressure sensor
  • the pressure sensor is used to obtain the pressure value applied by the fingerprint to be tested on the display panel
  • the processor is connected to the pressure sensor, and is used for splicing and combining multiple received partial fingerprint images when the pressure value is greater than 0 to form a complete fingerprint image.
  • the display panel further includes: a buffer layer;
  • the buffer layer is arranged on a side of the light shielding layer close to the light emitting device.
  • the first direction is the direction in which the fingerprint to be tested moves relative to the small hole imaging area when the small hole imaging area is used to detect the fingerprint; the second direction is perpendicular to the first One direction.
  • the entire small hole imaging area is detecting the fingerprint to be tested
  • only a part of the fingerprint to be tested can be imaged onto the sensor assembly at the same time.
  • the present application also provides a display device including the above-mentioned display panel.
  • the present application also provides a fingerprint identification method applied to the above-mentioned display panel, and the method includes:
  • the method further includes:
  • the multiple partial fingerprint images received are spliced and combined to form a complete fingerprint image.
  • said splicing and combining multiple received partial fingerprint images to form a complete fingerprint image includes:
  • the received multiple partial fingerprint images are spliced and combined to form a complete fingerprint image.
  • Figure 1 is a side view of a display panel in the related art
  • Figure 2 is a schematic diagram of the distribution of small holes in the related art
  • FIG. 3 is a side view 1 of a display panel provided by at least one embodiment of the application.
  • FIG. 4 is a top view of a light shielding layer provided by at least one embodiment of the application.
  • FIG. 5 is a light path diagram of a display panel provided by at least one embodiment of the application.
  • FIG. 6 is a second side view of the display panel provided by at least one embodiment of the application.
  • the specification may have presented the method and/or process as a specific sequence of steps. However, to the extent that the method or process does not depend on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As those of ordinary skill in the art will understand, other sequence of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation on the claims. In addition, the claims for the method and/or process should not be limited to executing their steps in the written order. Those skilled in the art can easily understand that these orders can be changed and still remain within the spirit and scope of the embodiments of the present application. Inside.
  • the display panel with fingerprint recognition function uses the small holes designed in the image sensor and the display panel to realize fingerprint recognition through the principle of small hole imaging.
  • the inventors have discovered through research that the small holes on the display panel in the related technology have a large distribution area, which causes a large number of pixels that cannot be displayed normally in the display panel, resulting in a poor imaging effect of the display panel.
  • Figure 1 is a side view of a display panel in the related art
  • Figure 2 is a schematic diagram of the distribution of small holes in the related art.
  • the display panel in the related art includes: a light-emitting device 1, a via 2 and a sensor 3. .
  • the principle of small hole imaging is: light travels in a straight line in the same homogeneous medium without being disturbed by gravitational force.
  • different positions of the finger reflect the light emitted by the light-emitting device 1, and the reflected light
  • the sensor 3 reaches different positions of the sensor 3 through the via 2 on the display panel.
  • the sensor 3 obtains a fingerprint image according to the received light, and compares and recognizes the collected fingerprint image with the original fingerprint to determine whether the fingerprint matches to realize unlocking.
  • the display panel in the related art detects fingerprints, the pixels of the display panel corresponding to the via 2 are in a constant light state.
  • the distribution area of vias 2 in the related art covers the fingerprint area, and the area of the distribution area of vias 2 is larger, which makes the number of pixels that cannot be displayed normally when detecting fingerprints, which leads to The imaging effect of the display panel is poor.
  • the distribution area of the via 2 in the related art is relatively large, but the width is relatively narrow, so that the display panel usually needs to provide a position prompt before detecting a fingerprint, which is not conducive to realizing touch.
  • embodiments of the present application provide a display panel, a fingerprint detection method, and a display device, which are specifically described as follows:
  • FIG. 3 is a side view 1 of a display panel provided in an embodiment of the application
  • FIG. 4 is a top view of a light shielding layer provided in an embodiment of the application.
  • the display panel is preferably an OLED display panel.
  • the display panel provided by the embodiment of the present application includes: a base substrate 10 and a light shielding layer 20, a light emitting device 30, and a sensor assembly 40 arranged on the base substrate 10; the light shielding layer 20 is located on the light emitting device Between 30 and sensor assembly 40.
  • the light shielding layer 20 includes a small hole imaging area 21, and the small hole imaging area 21 is used to image a local fingerprint to be tested onto the sensor assembly 40 when the fingerprint to be tested is detected.
  • the light emitting device 30 includes a detection area, and the orthographic projection of the detection area on the base substrate coincides with the orthographic projection of the aperture imaging area on the base substrate. Specifically, in this embodiment, when the fingerprint to be tested is detected, the fingerprint to be tested is placed on the detection area.
  • the base substrate 10 may be a rigid substrate or a flexible substrate, where the rigid substrate may be but not limited to one or more of glass and metal foil; the flexible substrate may be but not limited to poly Ethylene terephthalate, ethylene terephthalate, polyether ether ketone, polystyrene, polycarbonate, polyarylate, polyarylate, polyimide, polyvinyl chloride, One or more of polyethylene and textile fibers.
  • the light shielding layer 20 may be made of metal or non-metal light shielding materials.
  • Metal or black matrix material the embodiment of the present application does not make any limitation on this, and the embodiment of the present application does not specifically limit the thickness of the light-shielding layer, as long as the light-shielding effect can be achieved.
  • the thickness of the light shielding layer 20 in the embodiment of the present application is smaller.
  • no additional preparation process is required to fill the small hole imaging area.
  • the film layer on the side of the light-shielding layer 20 away from the base substrate 10 fills the small hole imaging area without affecting other performance of the display panel.
  • other preparation processes can be additionally provided to fill the small hole imaging area. The choice is made according to the specific situation and is not specifically limited here.
  • the light emitting device 30 specifically includes a thin film transistor, an anode, a light emitting layer, and a cathode.
  • the anode is connected to the drain electrode of the thin film transistor.
  • the light-emitting device 30 has a touch function, and may be self-capacitive or mutual-capacitive, which is not limited in the embodiment of the present application, and is specifically determined according to actual requirements.
  • the orthographic projection of the aperture imaging area 21 on the base substrate 10 is located on the display area AA of the base substrate 10.
  • the width of the small hole imaging area 21 is H, and the small hole imaging area 21 is used to image a local fingerprint with a width equal to the width of the small hole imaging area 21 onto the sensor assembly 40 when the fingerprint to be tested is detected .
  • the small hole imaging area 21 when used to detect the fingerprint to be tested, the fingerprint to be tested slides relative to the small hole imaging area 21 along the first direction indicated by the arrow in FIG. 4;
  • the width refers to the size of the aperture imaging area 21 in the above-mentioned first direction.
  • the size of the small hole imaging area 21 in the second direction perpendicular to the first direction is the length L of the small hole imaging area 21, as shown in FIG. 4.
  • the fingerprint to be tested is divided into a plurality of M partial fingerprints to be tested with a width H, and the M partial fingerprints to be tested are parallel to each other, and the sensor assembly 40
  • a complete fingerprint image is obtained by continuously detecting multiple partial fingerprints to be tested, that is, the fingerprint is scanned and detected when the fingerprint to be tested moves on the display panel.
  • the complete fingerprint image is superimposed based on parallel and equidistant partial fingerprints to be tested.
  • the display panel provided by the embodiment of the application includes: a base substrate and a light-shielding layer, a light-emitting device, and a sensor assembly disposed on the base substrate; the light-shielding layer is located between the light-emitting device and the sensor assembly; the light-shielding layer includes: small hole imaging Area, the small hole imaging area is used to image the partial fingerprint to be detected on the sensor assembly when the fingerprint to be detected is detected.
  • the small hole imaging area on the light-shielding layer in the present application images a local fingerprint to be tested into the sensor assembly, which reduces the distribution area of the small holes in the display panel, and increases the number of normal display pixels in the display panel. Improve the imaging effect of the display panel.
  • the light shielding layer 20 is located on the side of the base substrate 10 close to the light emitting device 30, and the sensor assembly 40 is located on the side of the base substrate 10 away from the light shielding layer 20.
  • the orthographic projection of the sensor assembly 40 on the base substrate 10 covers the orthographic projection of the aperture imaging area 21 on the base substrate 10, so that the length of the light path reflected from different positions of the fingerprint to be measured is basically the same, and reaches the sensor
  • the components 40 do not overlap each other, which improves the fingerprint resolution.
  • the length L of the small hole imaging area 21 is greater than the width of the fingerprint to be measured, and the width H of the small hole imaging area 21 is less than the length of the fingerprint to be measured.
  • the shape of the small hole imaging area 21 in this application is "long strip". Compared with the related technology, this arrangement increases the width of the small hole imaging area 21, so that when fingerprints are detected, the finger can be scanned upwards. There is no need to give a fingerprint detection position prompt, which is conducive to realizing touch and giving users a good use experience.
  • the shape of the opening 22 is circular or square, and the circular or square opening is more convenient and simple in actual design.
  • the shape of the opening can also be set to other shapes, such as a rhombus.
  • the embodiment of the present application does not limit the specific shape of the opening.
  • the openings can be formed by a patterning process, which includes: photoresist coating, exposure, development, etching, and stripping processes, which are not limited in the embodiment of the present application.
  • the diameter of the opening needs to be as small as possible, but not too small. If the diameter of the opening is too large Smaller size tends to cause too low illuminance on the surface of the sensor assembly 40, and difficult to extract imaging data.
  • the imaging data is better when the diameter of each opening is between 3 ⁇ m and 25 ⁇ m.
  • the sensor component 40 includes: an image sensor, which is used to obtain multiple partial fingerprint images of the fingerprint to be tested above the display panel passing through the aperture imaging area 21.
  • the buffer layer in the embodiment of the present application can diffuse the substance in the light-emitting device into the light-shielding layer in the subsequent process, which can improve the yield of the display panel.

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  • Inorganic Chemistry (AREA)
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  • Life Sciences & Earth Sciences (AREA)
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  • Microelectronics & Electronic Packaging (AREA)
  • Image Input (AREA)
  • Electroluminescent Light Sources (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

La présente invention concerne un écran d'affichage, un procédé de reconnaissance d'empreinte digitale et un dispositif d'affichage. L'écran d'affichage comprend un substrat de base, et une couche de protection contre la lumière, un dispositif électroluminescent et un ensemble capteur disposé sur le substrat de base, la couche de protection contre la lumière étant située entre le dispositif électroluminescent et l'ensemble capteur. La couche de protection contre la lumière comprend une région d'imagerie à trous d'épingle, la taille de la région d'imagerie à trous d'épingle dans une première direction étant inférieure à la taille d'une empreinte digitale à détecter dans la première direction, et la taille de la région d'imagerie de trou d'épingle dans une seconde direction étant supérieure à la taille de l'empreinte digitale à détecter dans la seconde direction ; et lorsque la région d'imagerie à trous d'épingle est utilisée pour détecter l'empreinte digitale à détecter, une partie de l'empreinte digitale à détecter est imagée sur l'ensemble capteur.
PCT/CN2020/080134 2019-04-10 2020-03-19 Écran d'affichage, procédé de reconnaissance d'empreinte digitale et dispositif d'affichage WO2020207221A1 (fr)

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CN201910283570.9A CN109993141B (zh) 2019-04-10 2019-04-10 一种oled显示面板、指纹识别方法和显示装置
CN201910283570.9 2019-04-10

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